body{background: url(img/4.jpg)repeat fixed!important;background-size: cover;font-size: 16px;}
.form{background: rgba(255,255,255,0.2);width:400px;margin:100px auto;}
#login_form{display: block;}
#register_form{display: none;}
.fa{display: inline-block;top: 27px;left: 6px;position: relative;color: #ccc;}
input[type="text"],input[type="password"]{padding-left:26px;}
.checkbox{padding-left:21px;}